2. Calculate the pH values of the following solutions of acids, bases, salts and buffer solutions
Acid solution 0.050 M H3AsO4 Ka1=5.6*10-3
Base solution 0.010 M (CaOH)2
Salt solution 0.010 M NaNO2 Ka1=5.1*10-4
Buffer solution 15ml 0.010 M CH2COOH 45ml 0.010 M CH3COONa Ka=1.74*10-5

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